The type of photography that you are planning to use is an important decision factor. Here we have evaluated the TTArtisan 27mm F2.8 and the Pentax 21mm F3.2 AL L for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. TTArtisan 27mm F2.8 is the longer of the two lenses at 41mm. The Pentax 21mm F3.2 AL L with a length of 25mm, is 16mm shorter. Besides being longer, the TTArtisan 27mm F2.8 also has a larger diameter of 64mm compared to the Pentax 21mm F3.2 AL L's 63mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. TTArtisan 27mm F2.8 weighs 94g, which means it is 40g (29%) lighter than the Pentax 21mm F3.2 AL L which has a weight of 134g.
Filter Threads
The TTArtisan 27mm F2.8 has a filter size of 39mm whereas the Pentax 21mm F3.2 AL L has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 39mm filters that we recommend you to consider for the TTArtisan 27mm F2.8:
And these are the 49mm filters that we recommend for the Pentax 21mm F3.2 AL L:
Lens Mounts
The TTArtisan 27mm F2.8 has the Sony E lens mount whereas the Pentax 21mm F3.2 AL L has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
TTArtisan 27mm F2.8 is also available in the Fujifilm X and Nikon Z mounts.
Pentax 21mm F3.2 AL L is also available in Pentax KAF mount.
Focal Range
TTArtisan 27mm F2.8 is a prime lens with fixed focal lenght of 27mm which has an effective (full-frame 35mm equivalent) focal range of
40.5mm when used on a APS-C / DX format camera.
On the other hand, the Pentax 21mm F3.2 AL L is a prime lens with fixed focal lenght of 21mm which has an effective (full-frame 35mm equivalent) focal range of 31.5mm when used on a APS-C / DX format camera.
